Meta

Tag: IAmMEC

​Recently had a customer with an Exchange 2013 Hybrid config require updating an expired SSL certificate. When they imported the new certificate and assigned it SMTP services, mail flow from on-premises to Office 365 stopped.

This was because the on-premises send connector to Office 365 was still configured to look for that expired certificate (which had also been deleted already).

The fix was to perform the following:

Open Exchange Management Shell on the on-premises Exchange server

Run Get-ExchangeCertificate, and note the Thumbprint of the correct certificate to be used.

Run $cert = Get-ExchangeCertificate -Thumbprint <thumbprint>

Set a new variable and assign it the concatenated values of the Issuer and Subject values of the certificate (must also include <I> and <S> before each field):$TLSCert = (‘<I>’+$cert.issuer+'<S>’+$cert.subject)

​Last month, in June 2014, the Exchange Team announced that Office 365 would soon have the public folder hierarchy folder count limit raised from 10,000 folders to 100,000 folders. This limit increase would begin to take effect in July, 2014.

But how can you tell what your tenant’s current folder count limit is?

Open a remote PowerShell session to your Office 365 tenant

Run the following command:Get-Mailbox -PublicFolder | Get-MailboxStatistics | fl FolderHierarchy*